On October 19 an inspector sent north from London to Sunderland reported a long-awaited arrival: the first British case of cholera. It was 1831 and as part of a second pandemic cholera had again progressed from its Bengal heartland through Europe, before reaching the Baltic ports. It was only a matter of time.

The British public, informed by newspaper reports, were acquainted with the symptoms: profuse watery diarrhoea, severe abdominal pain and often death within a matter of hours. In advance of its arrival in Russia thousands fled from the cities. In Poland it was killing one in two victims. And unlike today, where oral rehydration solution can prevent dehydration and shock, there was no effective treatment.

Compelling new scientific evidence suggests United Nations peacekeepers have carried a virulent strain of cholera — a super bug — into the Western Hemisphere for the first time.

The vicious form of cholera has already killed 7,000 people in Haiti, where it surfaced in a remote village in October 2010. Leading researchers from Harvard Medical School and elsewhere told ABC News that, despite UN denials, there is now a mountain of evidence suggesting the strain originated in Nepal, and was carried to Haiti by Nepalese soldiers who came to Haiti to serve as UN peacekeepers after the earthquake that ravaged the country on Jan. 12, 2010 — two years ago today. Haiti had never seen a case of cholera until the arrival of the peacekeepers, who allegedly failed to maintain sanitary conditions at their base.